Systematics and Ecology of Neotropical AraceaeFloristics of Araceae for Neotropical AreasHorticulture of AraceaePhenological Variations of Neotropical Floras

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Research EmphasesRevision of Dieffenbachia of Central AmericaPreliminary Revision of Dieffenbachia of South AmericaRevision of Rhodospatha for the NeotropicsRevision of Chlorospatha (with Lynn Hannon)Araceae for the Flora of MesoamericaAraceae for the Flora of EcuadorAraceae for the Flora of GuianasAraceae for the Flora of BoliviaAraceae for the Flora of Bajo Calima, Valle Dept., Colombia (with Dorothy Bay)Araceae for the Flora of La Planada, Nariño Dept., Colombia (with Jeffrey Lake)Araceae of Reserva Yotoco, Valle Dept., Colombia (with Eugenio Escobar)Araceae of La Planada (with Lynn Hannon and Richard Mansell)
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